US Patent 7980225 Fuel supply device for internal combustion engine

A device includes two fuel injection systems and a pulsation damper. Each system includes fuel injection valves and first and second delivery pipes. While fuel is pumped to the two fuel injection systems with a common fuel pump, the device intermittently drives the fuel injection valves to open, thereby supplying the fuel within the delivery pipes from the fuel injection valves. The paths through which the fuel passes include a first passageway, which has the first delivery pipe and a communication path, and a second passageway which has a branch path and the second delivery pipe. An opposing portion opposite to the opening of a placement channel in the first delivery pipe includes the opening of the branch path in the first delivery pipe. This enables one pulsation damper to precisely suppress fuel pressure pulsations occurring in the two delivery pipes.